Implement RGB565 multisample resolve.
Implement RGB565 multisample resolve.

Bug 20891368

Change-Id: I29054ccc0a91fdc41d26d26dd4f55dfd4dfca7e4
Reviewed-on: https://swiftshader-review.googlesource.com/3952
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader